Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Exercises of stock options (in shares)		12,000
Common stock issued to dividend reinvestment plan and employee benefits plans (in shares)	8,686	8,445
Vesting of restricted stock, net of shares surrendered to cover payroll taxes, shares issued (in shares)	24,005	15,945
Vesting of restricted stock, net of shares surrendered to cover payroll taxes, shares deferred (in shares)	23,967	19,450
Purchases of common stock (in shares)	826,482	305,052
Shares issued from deferred compensation plan, net of shares surrendered to cover payroll taxes (in shares)	63,606	70,044
Common stock dividends (in dollars per share)	$ 0.18	$ 0.16